Siemens SINAMICS G130 Engineering Manual page 273

Replacement of SIMOVERT P converters by SINAMICS
Since SIMOVERT P converters and SINAMICS converters are both designed as voltage-source DC link converters
and the matching motors feature either standard or relatively high-leakage models of rotor, it is generally easy to
replace a SIMOVERT P converter by a SINAMICS unit. However, the following aspects need to be taken into
account:
·
SIMOVERT P converters are existing as a standard version for 1Q operation and as an NGP version for
4Q operation (line-side converter for rectifier/regenerative operation). This must be taken into account to
ensure correct selection of the SINAMICS unit for 1Q or 4Q operation.
·
Parallel connections of converters are typically used for higher power range of 1LA8 motors and for the
complete 1LA1 motor range. However, the older 1LA8 motors and the 1LA1 motors for operation on
SIMOVERT P converters are not fitted with separate winding systems and this factor must be taken into
account in selecting the appropriate SINAMICS parallel converters. Further details regarding, for example,
minimum required cable lengths to the motor or use of motor reactors or filters can be found in section
"Parallel connections of converters" in chapter "Fundamental Principles and System Description".
·
SIMOVERT P converters operate on lower pulse frequencies than the newer SINAMICS devices. When a
SIMOVERT P unit is replaced by a SINAMICS, therefore, the stray losses in the motor and the motor
noise caused by the converter operation are slightly lower.
It is also important to note the potential problems affecting the motors:
·
Voltage stress on the motor winding
·
Bearing currents in the motor bearings.
Solutions to counter these problems are available. For example, motor reactors or motor filters can be installed at the
SINAMICS converter output, or the motor can be retrofitted with an insulated bearing in an approved service
workshop.
1. Measures recommended when replacing a 6SE35/36 transistorized frequency converter for a line supply voltage of
≤ 500 V
1.1 Operation with 1LA6 and 1LA8 motors:
·
Use a motor reactor on the SINAMICS converter to reduce the voltage rate-of-rise dv/dt and retrofit an
insulated bearing to the non-drive end of the motor
or
·
Use a dv/dt filter plus VPL or a dv/dt filter compact plus VPL on the SINAMICS converter, but do not
modify the motor
1.2 Operation with 1LA1 motors:
·
No measures required
2. Measures recommended when replacing a 6SC36/37 GTO converter for a line supply voltage of 600 V to 690 V
2.1 Operation with 1LA6 and 1LA8 motors:
·
Use a dv/dt filter plus VPL or a dv/dt filter compact plus VPL on the SINAMICS converter, but do not
modify the motor
2.2 Operation with 1LA1 motors:
·
No measures required
1)
Notice! If the motor is retrofitted with an insulated non-drive end bearing and also has a speed encoder, the
encoder must also be insulated or replaced by an encoder with insulated bearings.
General Engineering Information for SINAMICS
1)
SINAMICS Engineering Manual – November 2015
Engineering Information
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